Lock.



A. A. PAGE.

LOCK.

APPLICATION mzo MAY 13, ms.

Patented Aug. 20, 1918.

WITNESSES: JIM/5114.

.- ETD ST PAENT FFTQE.

ALBERT A. PAGE, OF EAST HAVEN, CONNECTICUT, ASSIGNOR TO SARGENT & COMPANY, OF NEW HAVEN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

LOCK.

Specification of Letters Patent.

v Patented Au 20, 1918.

Application filed May 13, 1915. Serial No. 27,855.

To all whom it may concern:

Be it known that I, ALBERT A. PAGE, a citizen of the United States, residing in East Haven, county of New Haven, and State of Connecticut, have invented certain new and useful Improvements in Locks, of which the following is a full, clear, and exact description.

This invention relates to locks and more particularly to master-keyed cylinder locks of the type having a plurality of rollbacks which are bodily displaceable relative to each other by the insertion of one key (emergency) without being so displaced by the insertion of another (change) key. A lock of the general kind to which I have reference is illustrated in Patent No.

1137803, granted to Sargent & Company on May 4, 1915, as assignee of William E. Sparks. However, in some aspects of my invention, it is not necessary that the cylinder be of the master-keyed type and that it be provided with a plurality of rollbacks.

The primary objects of the invention are the provision of a master-keyed cylinder lock having an improved and simplified mounting for the so-called emergency rollback, whereby said rollback is operatively actuated by one key, but not by another key; and the general simplification and improve ment in construction and operation of devices of the class to which the invention relates.

To these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawing,

Figure 1 is a side elevation of a cylinder lock embodying my improvements with the change key inserted therein.

Fig. 2 is a rear elevation of the lock.

Fig. 3 is a longitudinal section of Fig. 1.

Fig. 4 is a view similar to Fig. 3, but 1sholwing the emergency key inserted into the Fig. 5 is a perspective view of the rear portion of the lock with the emergency rollback or cam arm omitted; and Fig. 6 comprises detail, edge and face views of the emergency rollback or cam arm.

My invention pertains to that class of locks in which the change key and the emergency key will both rotate the rollback, dog

or cam arm connected to the rear end of the key plug of the cylinder lock, which rollback, dog or cam arm is in a position to engage one part of the latch or lock mechanism in a mortise lock with which the cylinder lock is associated. The rollback connected to the key plug may be called the regular or primary rollback. In addition to thisprimary rollback, there is a second or auxiliary rollback, forming a permanent part of the cylinder lock which is normally so positioned relative to a part of the latch or look mechanism as to be incapable of actuating the same, but which is moved into operative position relative to said part when the emergency key is inserted into the keyway without being so moved when the change key is inserted into the keyway. Thus, the change key actuates only one rollback in an operative manner and one part of the latch or look mechanism, while the emergency key actuatesa plurality of rollbacks in an operative manner and the corresponding parts of the latch or look mechanism.

Referring to the drawing, the cylinder lock which I have selected for illustration comprises a case 10, a key plug 11 rotatable therein, and pin tumblers 12 acted on by springs 13 and cooperating with the key plug and case in the well-known manner. All of these parts may be of standard construction. Secured to the rear end portion of the key plug, immediately at the rear of the case 10, is an ordinary dog or rollback 14: of more or less usual form, which in this case is secured to the key plug by screws 15 (Fig. In the example shown, an extension on the key plug, which is employed for mounting and guiding the emergency rollback, is formed integral with the key plug at the rear portion thereof, as shown by 16. The extension 16 is formed by reducing the rear extremity of a comparatively long key plug, and the extension passes through a slot 17 which is cut in the regular rollback 14. for that purpose. The emergency or auxiliary rollback is shown at 17, and it will be observed that it is located at the rear of the rollback 14 and is movable forwardly and rearwardly on the extension 16 which forms a support and guide for the same. For this purpose, the emergency rollback, which may conform generally in outline to the rollback 14c, isprovided with a hub portion 18 embracing the guide'16 and non'-' rotatively engaged therewith. In the example shown, the extension 16 incloses a portion of the keyway at opposite sides and is or substantially rectangular cross section, and the rollback 1)? is provided with a guide slot 19, which embraces and conforms closely to the extension.

The emergency rollback 1'? is normally held in an advanced position in close proximity to the regular rollback by means of a spring 20. in the embodiment illustrated, this spring 20 is in the form of a coil and it is interposed between the rear "face of the emergency or auxiliary rollback and the front face of a disk 21 securedto the rear end of the key plug extension, for example, by means of the screw The spring 20 is held in place by embrcing the hub 18 on the auxiliary rollback and a somewhat similar hub on the disk 21 as shown in Fig. 3.

The change key 23 will rotate the key plug 11 in the usual manner and with it both rollbaeks 1 and 17, the latter rollback remaining in the normal or advanced position in which it is ordinarily held by the expansive force or the spring 20.

The emergency key 2%, however is adapted to shift the rollback l7 rearwardly with respect to the rollback 1 1: when said key is inserted into the keyway as shown in Fig. 4c. This result is obtained by making the emergency key a trifle longer than the change key, so that one of the end surl'aces of the key shank will engage the rollback 17 which is in the nature of a slide projecting into the key ray. it will be observed that the key plug extension does not extend to the bottom of the key plug or to the bottom of the keyway, and that as the hub portion of rollback 17 conforms closely to the extension 16 at the bottom of the latter, the rollback 1'? presents a shoulder projecting into the keyway and extending into the path of insertion of the emergency key so that said key will shift said rollback rearwardlv on the extension into the position shown in Fig. in the particular form shown, the rear extremity of the erect 'ency key is provided with a beveled surface 26.

contacting the shoulder 25 on the rollback 17 at the lower part of the keyway, but this construction is susceptible of considerable variation. In the example shown, the thrust of the emergency key is exerted at a point eccentric to the axis of the rollback 17, and therefore the bearing of the rollback l? on the extension 16 is enlarged by a lug 2? to prevent the rollback from canting on its guide. E -Fhen the emergency rollback is in. its normal advanced position, the lug 27. enters a correspondingly termed recess 28 in the rollback i l.

It will be understood that when the parts are in the position shown in Fig. 1, the regular rollback 1a is in a position to cooperate with the co-acting part of the lock or latch mechanism, but the emergency rollback 17 is not in a position to engage and operate its co-acting part of the lock or latch mechanism and is only placed in an operative po sit-ion relative to such part by being thrust rearwardly by the emergency key as shown in Fig. i.

The disk 21 not only serves as an abutment for the spring 20, but also as a stop for the cylinc or lock. When the cylinder lock is screwed into the case of the mortise lock, the disk 21 abuts the rear wall of the mortise case and arrests the cylinder lock in the proper position. The hub portion 18 of the rollback 1'? not only serves as a centering means for the spring 20 but as a stop for said rollback to arrest the rearward movement of the latter at the proper point by abutting the disk 21.

Various changes may be made in the details of the construction without departing from the scope of the invention.

ll hat T claim is:

1. it cylinder lock having a key plug and a rollback embracing and engaging the key plug and guided on the latter lengthwise of the lock; substantially as described.

2. A cylinder lock having a key plug, an extension on the rear end of said key plug, and a rollback embracing and guided longitudinally on said extension; substantially as described.

A cylinder lock having a rollback fixed to the key plug and a second rollback slidable on the key plug at the rear of the first rollback; substantially as described.

at. A cylinder lock having a rollback fixed to the key plug, a rearwardly directed extension on said key plug, and a second rollback rearwardly movable on said extension at the rear or said first rollback; substantially as described.

5. it cylinder lock having a rollback secured to the key plug, an extension on said key plug passing through said rollback, and a second rollback guided on said extension; substantially as described.

6. A cylinder lock having a key plug, a rollback secured to said key plug, an extension integral with said key plug and passing through said rollback, and a rollback engaging and slidable on said extension at the rear of said first rollback; substantially as described.

7. A pin tumbler lock having a key plug, said key plug provided with a keyway, a primary rollback secured to said key plug, two keys insertible into said keyway, and an auxiliary rollback slidably mounted at the rear of said first rollback and having a hub portion formed and located for engagement by one of said keys, but not by the other he subs antially as described.

L cylinder lock having a key plug with l a keyway, a rollback embracing the rear extremity of the key plug, and a key for moving said rollback rearwardly; substantially as described.

9. A cylinder lock having a key plug with a keyway, a rollback embracing the rear portion of the key plug, and a key to engage said rollback directly and move it rearwardly; substantially as described.

10. A cylinder lock having two rollbacks embracing the key plug, both of said rollbacks being non-rotatively interlocked with the key plug, but one of said rollbacks being slidable on the latter; substantially as described.

11. In a cylinder lock the combination of a case, a key plug therein, pin tumblers cooperating with the case and key plug, a part extending rearwardly from said key plug, a rollback embracing and slidable on said rearwardly extending part, and stop means on said rearwardly extending part for limiting the sliding movement of said rollback; substantially as described.

12. A cylinder lock comprising a case, a key plug therein, pin tumblers cooperating with the case and key plug, a rearwardly directed extension on the key plug, a rollback slidably mounted on said extension, stop means secured to the end of said extension, and a spring interposed between said stop means and said rollback; substantially as described.

13. A pin tumblerlock having a key plug, a primary rollback, and a secondary roll back movable bodily relatively to said pri mary rollback and having a part embracing and extending into the keyway.

14. A cylinder lock having a key plug with a keyway, a rollback embracing and non-rotatively engaged with the rear portion of the key plug, a key to turn said key plug and thereby rotate said rollback in one plane, and another key for displacing said rollback rearwardly and rotating it in another plane; substantially as described.

15. A cylinder lock having a key plug with a keyway, a rollback embracing and non-rotatively engaged with the rear portion of the key plug, said rollback having a portion extending into the keyway, a key to turn said key plug and thereby rotate said rollback in one plane. and another key for turning the key plug adapted to abut said rollback directly and thereby shift it rearwardly; substantially as described.

16. A cylinder lock having a key plug with a keyway, a rollback having an opening by which it embraces the rear portion of said key plug, said opening having an edge extending into the keyway, and a key insertible into the keyway and formed to engage the edge of the opening in the rollback so as to shift the rollback rearwardly; substantially as described.

17. A cylinder lock having a key plug, and a plurality of rollbacks at least one of which is bodily displaceable relatively to another by the insertion of a key, both of said rollbacks directly engaging and mounted on the key plug; substantially as de scribed.

18. A cylinder lock having a key plug, a plurality of rollbacks at least one of which is bodily displaceable relatively to another by the insertion of a key, and means for fixing one of said rollbacks to the rear portion of the key plug, the other rollback extending around and slidable on the key plug; substantially as described.

19. A cylinder lock having a key plug, with a keyway therein a stop disk on the rear end of the key plug, a rollback mounted to slide rearwardly on the key plug, and a spring interposed between said rollback and said stop disk: substantially as described.

20. A cylinder lock having a key plug, a rollback extending around and guided longitudinally on said key plug, and a spring embracing the key plug and acting on said rollback to hold it normally in a predetermined position; substantially as described.

21. A cylinder lock having a key plug, said key plug provided with an extension at the rear end thereof, a rollback engaging and guided longitudinally on said extension, and a stop at the rear end of the extension.

22. A cylinder lock having a key plug, a longitudinally movable rollback mounted on the key plug. and a stop disk on the rear end of the key plug.

23. A cylinder lock having a key plug, an extension on the rear end of the key plug, a rollback engaging and guided longitudinally on said extension in a forward and rearward direction with respect to the lock, and a spring for holding said rollback normally in a predetermined position, located outside of said extension.

In witness whereof. I have hereunto set my hand on the 12th day of May, 1915.

ALBERT A. PAGE.

WVitnesses:

MABEL A. BUssE, HELEN F. STAHNKE.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents,

Washington, D. G. 

